Sitecatalyst tracking

'A' is a registration page, with some input fields followed by page 'B' and 'C'(with some inputs). 'D' is a completed page where we will get confirmation message that your registration is successful with only a login button to go the login page.

Question:

This a new user registration flow. In the 'D' page I need to track whether the customer is recognized as new customer, already existing customer or pending customer .

please someone help on this.